District of coltjicbia



1. F. GARBIN. MICROMETER. APPLICATION E ILED JUNE 3. 1918 Patent-ed J ue 24, 1919.

Ime/Wto@ J j. Harbin,

61cm/vm,

UNITED sTATEs PATENT oEEIoE.

:runas E. enema, or WASHINGTON, DISTRICT or' COLUMBIA. l

T0 all whom t may Concern: l Be it known that I, JULES F. GARBIN, a citizen of the Unitedy States, residing at Washington, District of Columbia, have invented certain new and'useful Improvements in Micrometers, of which the following is a specification. Y

This invention relates to micrometers, and has for its primary object to provide Van instrument of this character adapted `to eX-` ternal or internal use, which will` be very accurate and reliable, simple and compactA in the arrangement ofits several parts, and capable of easy and quick adjustment.

It is another andl more particular object of my invention to provide very novel and. effective means for safely locking the movable element of the micrometer against" casual movement from its adjusted position. l l Y l l It `is also an important object of the in` vention to provide a micrometer, which is` of such construction that it can also be con veniently used as aV height gage, a sizing block or a caliper gage. With the above `and other objects in view, the invention consistsin the improved combination, construction and relative arrange' ment of the several parts as will be here1n after more fully described, subsequently claimed, andr illustrated in the accompanying drawing, in which` similar reference characters designate corresponding `parts throughout the several views, andwhereinw Figure l is aside elevation, showing my improved micrometer adapted for use as a height gage; l

Fig. Qis a longitudinal sectional view; Fig. 3` is an enlarged horizontal section taken on the line 3-3 of Fig. 2.;

Fig. 4 is a detail perspective view of the internal member; A

Fig. 5 is a similar view of the locking member; v Fig. 6 isa side elevation showing` the device adapted for use as a calipergage;` Fig. 7 is a detail perspective view ofgan` auxiliary attachment'for use in` taking 1nside measurements; and y Fig. 8 is a side elevation, partly in section, of a detachable `extension `for the mi'- crometer, whereby it may be lengthened,

Referring in detail to the drawing, 5 designates the outer tubular member 1 of the micrometer, which is open at one end, and at its other end is formed with an axially "extending threaded socket yto receive a "tends axially` through said member compensated for.

MIcnoMETEm Specification of Letters Patent. J 24:, 1919.

nppncation nea June 351918. serial No. 237,990.

clamping screw `6, the purpose of which will bepresently explained. A screw 7 is integrallyformed at one of its ends with the closed end of the member 5, and eX- 1n spacedconcentric relation `to the annular wall thereof andy projects beyond its open end. Thisscrew may have any desired predeterminednumberof threads to the inch inl-,accordance with the fineness of the adjustment whichfmay be desired.

8 designates the annular tubular member ofthe micrometer, which also has a solid end 9 formed withla threaded socletto receive a secondfclamping screw `corresponding tothe clamping screw 6. At its other end the member `i8 isl interiorly threaded to receive a cylindrical eXteriorly `threaded bushing`10, saidbushing `having a flange 11 formed on one end to extend over the end edge of the member 8. The engaging threads on this bushingY aiid the member 8 are of saw-toothtype, as shown in Fig. 2, and the bushing is longitudinally split as at 112. The bushing lOis -further provided with interior screw threads with which the which tendsto contract the split tubular bushing. `In this manner, therefore, it will be apparent that the frictional pressure of the interior threads on the nut with the threads ofthe screw 7 may be properly regulated and wear upon the bushing threads The member 8 has an internal diameter whichyis `appreciably` less than the internal diameter of `the `member 5, and upon one side of the member 8a longitudinally eX- tending` plate 14 is suitably secured. This plate is transversely curved in concentric relation to the member 8, and has its outer The locking member 16, which is also" of tubular form fits snugly upon the member 8, and said locking member on one side is longitudinally cut away as at 17. The memconvex `face properly graduated as indicated y uated `plate 14 on the member 8' extends longitudinally through the cut-away side 17 'of the loc-king member 16, and beyond the interiorly threaded collar 19 formed in said mem-beras clearly seeniin Fig; 4. When this locking member is rotated to dispose the edgel ofits body portion at one side yof the opening' 17 iii-contact with the graduated edge of the plate 14, the screwl 7 ycan be readily turnedthreugh vthe threaded flange 19 on the locking member and the part 5 o-f the micrometer `adjusted-upon the member Sand overl the graduated surfaeeef the plate 14. One end of the adjustable memberI 5 is beveled to, a knife edge as at. 21, and suitably graduated as shown in Fig. 1, which graduations are read in conjunctionwith the indicativel numerals on the graduated face of the, .plate 14.l l j v When the member 5 has been adjusted to the desired point, the locking member 16 is rotated in one direction, suchrotation causing'the threads 20 to bind tightly upon the threads of screw 7, and thereby locking the member against rotation or longitudinal movement' from its adjusted position. In this manner it-will be seen that the micrometer maybe very easilyy and quickly adjustedv and-after being securelylocked by means of -the'memberv 16, the instrument can f be lfreely handled without danger of changing the-adjustment of the member 5 with re-y spectv to the graduated surface 15.

In Fig. 1 0f the drawing, I have shown the The member is securely-xed lto the underside of the arm 23 by mea-ns of the screwV 6, and after releasing the locking member 16,\the 4member l9 vis turned until it engages the surface ofthe base upon whichthe work is supported.` vA further adjustment of the member 8 moves the member 5 `and the bar 22`vupwardly, and by observing the graduated surface 15y the operator can, byrotating the member 16 securelylock the member 5 in the proper adjusted position, and then Lby movingfth'e ymicrometer relativeto the work, an lindicatingline -erfmark may be made upon the surface of the work by the end 'of the arm.23. A

The locking memberis.

In Fig. 6 of the drawing I have shown the device used as a caliper gage in which case an-arm 25 is secured to each end of the micrometer by means of the corresponding` screw 6, the said arms projecting from the said side of the instrument. By then adjusting the members 5 and 8 relative te each other, the arms 25 can be disposed at any desired predetermined distance from each other.

In using the micrometer for taking inside measurements, as, for instance, in measuring the bore of a tubular part, one the conical heads 2G shown in Fig. 7 is attached to each of the relatively opposite ends of the members 5 and 9, each head having an axially projecting threaded stud 27 for engagement in the th-readed socket of the micrometer. The points of these conical members wil-'l engage the diametrically opposite sides of the bore when the parts of the micrometery are properly adjusted, the said parts being then locked by means of the member ,16, and the micrometer removed.

In some cases, the part torbe measured may be of such size that the adjustment of the par-ts of the micrometer, as provided, is not sufficient in order to enable the instrument to be used. 'In such case, I employ an extension member 2S having a threaded axiallyl projecting stud 29 on one end and a threaded socket 30 in its other end. Any desired number of these members may be used, and they may be attached either to the member 5 or the member 9 of the instrument. The auxiliary members 28 are, of course, of predetermined length, so that, by reading the graduated plate 14 and then adding to such reading the length of the member or members 2S which may be employed, the to- 105 tal height .or diameter of the part may be accurately determined.

From the foregoing description, taken in connection with the accompanying drawing, it will be seen that I have devised a very 110 simple as well as serviceable and reliable instrument which can be readily adapted to a variety of uses. The relatively adjustable parts of the micrometer can be quickly and securely locked by a relatively slight rota- 115 tive movement-of the member 16, and the use of set screws or other clamping or holding means which are liable te become loosened, is avoided. Such parts are also liable to be lost, and constitute obstructions such 120 as, in many cases, will prevent the proper application and use of the instrument. The present invention provides a very compact assemblage or arrangement of. the several elements, and the adjusting means and lock- 125 ing means being entirely'inclosed within the outer tubular partl of the micrometer, metal dustk or other foreign matter cannot collect thereon and interfere with its proper opcration; By .also providing the adjustable split 130 bushing' in which the adjusting screw isV threaded, wear upon the threads is taken up or compensated for, so that the usefulness of the instrument will not be affected. The micrometer can, of course, be constructed in various sizes and provision made for any desired range of adjustment. It will also be observed that the several parts are of comparatively simple construction so that the device can be manufactured at relatively small manufacturing cost.

While I have herein shown and described the preferred construction and arrangement of the various elements, it is to be understood that the same are susceptible of considerable modification, and I therefore reserve the privilege of adopting such legitiemate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim is 1. A micrometer including tubular telescopically engaged complementary members, one of said members having a threaded rod extending within the other member, and an adjustable element carried by the latter member adapted for binding engagement with the threads of said rod to lock said members in their adjusted positions.

2. A micrometer including tubular telescopically engaged complementary members, one of said members having a threaded rod extending` within the other member. and a sleeve mounted upon the latter member and extending within the other member, said sleeve being adapted for relative rotation on said member and having means at one end' for binding engagement with the threads on said rod to lock the members in justed positions.

3. A micrometer including telescopicallyengaged tubular members, one of said members having a part engaged within the other member, a sleeve mounted upon the latter member forn limited rotation relative thereto and extending within the irst-named member, and said sleeve having means at one of in which said rod is engaged, said sleeve being adapted for rotation upon the inner member to cause the threads of said collar their adw j to bind upon the threads on said rod and thereby lock the members in their adjusted positions against casual rotation.

5. A micrometer including telescopieally engaged complementary members, the outer member having a threaded rod extending axially therethrough, said rod having a threaded engagement in the end of the inner member, a sleeve rotatably mounted upon the inner member and having` a threaded collar at one end, the threads on said collar vbeing adapted to bind upon the threads on said rod when the sleeve is rotated in one direction to lock said members against relative rotation, and means to limit the rotation of said sleeve in the opposite direction to position the threads of said collar whereby the rod may be adjusted through the collar.

6. A micrometer including, complementary telescopieally engaged members, a split bushing adjustable in the end of said inner member and having interior screw threads, :said outer member being provided with an axially extending threaded rod engaged in said bushing, said bushing and the inner member having` co-acting means whereby the bushing is contracted when rotated to compensate for wear upon the threads thereof, and manually adjustable means mounted within said outer member and `co-acting with said threaded rod to lock the inner and outer members against relative rotation.

7. A micrometer including telescopicallyengaged tubular members, one of said members having a threaded rod extending within the other member, and an element rotatable upon the latter member to effect binding engagement of said element upon its rotation in one direction upon the threads of said rod whereby said members are locked in their adjusted positions.

8. A micrometer including relatively adjustable members, and means for locking said members in their adjusted positions consisting of a single element rotatably mount ed upon one of said members, whereby said element, when rotated in one direction, has frictional binding engagement with the other member.

9. A micrometer including rela-tively adjustable members, one of said members hav ing a threaded part operatively connected to the other member, and a locking element rotatably engaged upon the latter member and having threaded engagement with said part, rotation of said element in one direction relative to said members effecting its frictional locking co-action with said part to retain said members in their adjusted positions.

In testimony whereof I affix my signature.

JULES F. GARBIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

